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Which of the following is a useful feature for an organic paleoenvironment proxy?  

In what order do you expect microbes to reduce the following compounds with increasing depth?

Water in peat bogs limits the flow of O2 into the soils. Why are lower O2 levels important for preserving greater amounts of peat and eventually coal? 

What causes oxygen minimum zones to expand suddenly? 

Describe a way moons can generate enough heat to sustain liquid oceans outside of the habitable zone? 

Which of the following is an example of inorganic carbon?

The Biological pump refers to the: 

In addition to an overall yearly upward trend, atmospheric CO2 values fluctuate seasonally. What drives this seasonal fluctuation? 

Polar compounds are soluble in water because their charged regions are attracted to the positive and negative charged regions of water molecules, causing them to break apart as ions. 

Particles and dissolved compounds in river water come from ___.  Choose all that apply